What Causes the Engine to Cut Out While Driving?

[LeAvery]

Causes and solutions for engine cut-out phenomenon: 1. Excessive or insufficient spark plug gap. A too-small gap weakens the spark and may cause carbon deposits to bridge the electrodes, preventing spark generation. An overly large gap increases the required breakdown voltage, overloading the ignition coil. When breakdown voltage exceeds the system's capacity, the spark plug fails to generate sparks, especially prone to misfiring at high speeds. Solution: Adjust spark plug gap. 2. Low fuel system pressure. Solution: Conduct fuel pressure testing. The gauge reading should match specifications in the vehicle manual. If pressure is too high, inspect the fuel pressure regulator; if too low, check the electric fuel pump, fuel filter, and pressure regulator. 3. Dirty fuel injectors causing unstable engine operation. Solution: Check fuel condition and perform engine air-fuel ratio testing.